Fortinet FortiClient IPsec improper validation of certificate with host mismatch (FG-IR-24-365)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
##

include('compat.inc');

if (description)
{
  script_id(238103);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/03/27");

  script_cve_id("CVE-2024-54019");

  script_name(english:"Fortinet FortiClient IPsec improper validation of certificate with host mismatch (FG-IR-24-365)");

  script_set_attribute(attribute:"synopsis", value:
"remote Windows host is missing one or more security-related updates.");
  script_set_attribute(attribute:"description", value:
"The version of FortiClient installed on the remote host is prior to tested version. It is, therefore, affected by a
vulnerability as referenced in the FG-IR-24-365 advisory.

  - A improper validation of certificate with host mismatch in Fortinet FortiClientWindows version 7.4.0,
    versions 7.2.0 through 7.2.6, and 7.0 all versions allow an unauthorized attacker to redirect VPN
    connections via DNS spoofing or another form of redirection. (CVE-2024-54019)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version
number.");
  script_set_attribute(attribute:"see_also", value:"https://www.fortiguard.com/psirt/FG-IR-24-365");
  script_set_attribute(attribute:"solution", value:
"For 7.0.x, see vendor advisory. For 7.2.x, upgrade to FortiClient version 7.2.7 or later. For 7.4.x, upgrade to
FortiClient version 7.4.1 or later.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:H/Au:N/C:P/I:P/A:N");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2024-54019");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");

  script_set_attribute(attribute:"vuln_publication_date", value:"2025/06/10");
  script_set_attribute(attribute:"patch_publication_date", value:"2025/06/10");
  script_set_attribute(attribute:"plugin_publication_date", value:"2025/06/10");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:fortinet:forticlient");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Windows");

  script_copyright(english:"This script is Copyright (C) 2025-2026 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("forticlient_detect.nbin");
  script_require_keys("installed_sw/FortiClient");

  exit(0);
}

include('vdf.inc');

# @tvdl-content
var vuln_data = {
  'metadata': {'spec_version': '1.0'},
  'checks': [
    {
      'product': {'name': 'FortiClient', 'type': 'app'},
      'check_algorithm': 'default',
      'constraints': [
        { 'min_version' : '7.0', 'fixed_version' : '7.0.999999', 'fixed_display' : 'See vendor advisory' },
        { 'min_version' : '7.2.0', 'max_version' : '7.2.6', 'fixed_version' : '7.2.7' },
        { 'min_version' : '7.4.0', 'fixed_version' : '7.4.1' }
      ]
    }
  ]
};

var result = vdf::check_and_report(vuln_data:vuln_data, severity:SECURITY_WARNING);
vdf::handle_check_and_report_errors(vdf_result:result);